FIR: Prohibit calling singletons' constructors

compiler/fir/analysis-tests/testData/resolve/visibility/singletonConstructors.kt

@@ -0,0 +1,31 @@
+class A {
+    companion object Comp {}
+
+    fun foo() {
+        <!INAPPLICABLE_CANDIDATE!>Comp<!>()
+    }
+}
+
+object B {
+    private val x = <!INAPPLICABLE_CANDIDATE!>B<!>()
+}
+
+class D {
+    companion object Comp2 {
+        operator fun invoke() {}
+    }
+
+    fun foo() {
+        Comp2()
+    }
+}
+
+enum class E {
+    X {
+
+    };
+
+    fun foo() {
+        <!UNRESOLVED_REFERENCE!>X<!>()
+    }
+}